Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair value
Fixed income securities	$ 42,485	$ 42,136
Short-term investments	4,173	4,009
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	92	1,002
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(2,977)	(242)
Short-term investments	(1)	0
Derivative instruments	(3)	(3)
Unrealized net gains (losses)
Fixed income securities	(2,885)	760
Short-term investments	(1)	0
Derivative instruments	(3)	(3)
Limited partnership interests	2	(1)
Unrealized net capital gains and losses, pre-tax	(2,887)	756
Other unrealized net capital gains and losses, pre-tax	26	5
Deferred income taxes	608	(163)
Unrealized net capital gains and losses, after-tax	$ (2,253)	$ 598